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registry prep 2
registry prep Qs 2
| Question | Answer |
|---|---|
| LET and RBE are related how | directly proportional |
| GCF formula | mAs1/mAs2=GCF1/GCF2 |
| mm to cm conversion | 1mm = .1cm |
| convert 100mm to cm | 100mm = 10cm |
| in to cm conversion | 1in = 2.54cm |
| convert 12in to cm | 12in = 30.48cm |
| heat unit formula (single phase) | kVp X mA X s |
| heat unit formula (3phase 6pulse) | kVp X mA X s X 1.35 |
| heat unit formula (high frequency) | kVp X mA X s X 1.41 |
| turns ratio for step up transformer | greater than 1 |
| turns ratio for step down transformer | les than 1 |
| Z number | atomic number (number of protons) |
| A number | mass number (number of protons + neutrons) |
| Neutron number | mass number – atomic number |
| What is the speed of light? | 3 X 10(8) m/s |
| Covert 10ms to S | 10ms = .01 |
| ms to s | 1ms = .001ms |
| mREM to mSV | 1mREM = .01mSV |
| rem to sv | 1rem = .01sv |
| an ionization chamber is located | between the tabletop and the IR |
| a phototimer is located: | under the cassette |
| reproducibility error margin | +/- 5% |
| linearity error margin | +/- 10% |
| tube housing leakage limit | 100mR/hr at 1m from tube |
| PBL error margin | +/- 4% of the SID |
| A spinning top is used to measure | timer accuracy on a single phase |
| Max tabletop intensity in flouro | 10R/min |
| SID error margin | +/- 2% of the SID |
| Annual occupational dose limit (in rem, mrem, sv and msv) | 5rem, 5,000mrem, .05sv, 50msv |
Created by:
annaluz87
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